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Moderate severityNVD Advisory· Published Oct 10, 2023· Updated Oct 29, 2025

Apache Tomcat: Trailer header parsing too lenient

CVE-2023-45648

Description

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.

Older, EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.apache.tomcat:tomcatMaven
>= 11.0.0-M1, < 11.0.0-M1211.0.0-M12
org.apache.tomcat:tomcatMaven
>= 10.1.0-M1, < 10.1.1410.1.14
org.apache.tomcat:tomcatMaven
>= 9.0.0-M1, < 9.0.819.0.81
org.apache.tomcat:tomcatMaven
>= 8.5.0, < 8.5.948.5.94
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 11.0.0-M1, < 11.0.0-M1211.0.0-M12
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 10.1.0-M1, < 10.1.1410.1.14
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 9.0.0-M1, < 9.0.819.0.81
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 8.5.0, < 8.5.948.5.94
org.apache.tomcat:tomcat-coyoteMaven
>= 11.0.0-M1, < 11.0.0-M1211.0.0-M12
org.apache.tomcat:tomcat-coyoteMaven
>= 10.1.0-M1, < 10.1.1410.1.14
org.apache.tomcat:tomcat-coyoteMaven
>= 9.0.0-M1, < 9.0.819.0.81
org.apache.tomcat:tomcat-coyoteMaven
>= 8.5.0, < 8.5.948.5.94

Affected products

33

Patches

Vulnerability mechanics

References

12

News mentions

0

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